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Old 01-17-2014, 06:39 PM
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2002 Manual Climate Control Problem

Hello all,

New to this group and glad to have found you!!

I have a 2002 Grand Cherokee Laredo with manual climate control. I can change the temperature from cold to hot air without any problem, however when I try to change from hot back to cold the vents will still blow warm air. The only work around I have found for this is to shut the fan off then turn the temperature to cold then turn the fan on again to get cold air. I have been researching this problem online but can not find any similar posts. The vents are all operational and functioning well, it is just this problem of not being able to change from warm to cold air unless the fan is turned off and then temperature is adjusted.

Any insight would be greatly appreciated. Thanks
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Old 01-18-2014, 06:23 AM
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Re: 2002 Manual Climate Control Problem

Welcome to the garage.
The manual system uses one electrical actuator to move the one blend door. Or this door has too much friction to move, or the actuator is too weak.
You will have to remove the glove box and then will see the actuator behind it. Remove the actuator and try to move the door by hand and see if it binds or is hard to move. If ok, most probably the actuator is too weak. Also check the actuator connector for any corrosion or moisture, because this could cause electrical resistance and less force from the actuator.
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Old 01-18-2014, 05:13 PM
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Re: 2002 Manual Climate Control Problem

Thank you for your reply. I know the actuator is accessible with the glove box removed, will I need to make a cut to check the blend door movement? I just looked at the heater treater site and from what I have read and videos i have watched, it seems that I will need to make a cut to access the blend door or is the cut only necessary once you determine it needs replacement. Just want to fully know what I am getting myself into before I begin.

Thanks again.

Sandy
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Old 01-18-2014, 07:09 PM
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Re: 2002 Manual Climate Control Problem

Hi Sandy, no cutting necessary for now. You only have to determine where the problem is to know where to go from there. If you can move the blend door easily by hand from where the actuator normally connects (never tried this myself, so don't know what is normal force and what is excessive) (also try this with fan on, to feel the difference), then most probably the problem lays with the actuator. If the door is hard to move, you could try some lubricant like WD40 or alike on the blend door rotating shaft, eventhough you can only reach one side. You probably need some kind of tool to put on the blend door axle to move it, but check for binding and/or hard to move.
If it is hard to move and the lubrication didn't help, then you could decide to go the heater treater way and cut an opening in the HVAC housing to get access to the blend door.
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